Brother Cheng, which episode was beheaded?

Brother Cheng was beheaded in the last episode of Campus Day. In this episode, because Katsura Kotonoha saw Cheng Ge and Saionji Sekai together, Katsura Kotonoha blackened, and directly raised a firewood knife to cut Cheng Ge's head off. It should be noted that the information here is based on existing public data and information, but there may be exceptions or disputes, so it is best to refer to real data for questions involving real people or events.